VIKKSAER LM487 LED Flasher Relay — Replacement for Chevy, GMC, Cadillac & Hummer 03-07 GMT800 (10383321 / 15764135)

Overview

The VIKKSAER LM487 LED Flasher Relay is a compact, plug‑and‑play replacement crafted for select GM GMT800 vehicles. It fits in the same slot as the original module, delivering a clean, almost seamless upgrade experience for drivers who have added LED bulbs to their turn signals or hazard lights. The goal is to restore the familiar cadence of your signals without the uncertainty of a buzzing or erratic flash.

Key benefits

• Directly replaces OEM numbers 10383321, 15764135, 10383320, 15231201, LM487, and EFL-27, simplifying compatibility checks and installation planning.
• Addresses LED hyperflash by returning standard flash timing, helping signals look consistent across day and night driving.
• Designed for GMT800 platform vehicles from 2003–2007, including Silverado, Sierra, Tahoe, Suburban, Escalade family, and Hummer H2.
• Plug‑and‑play installation with a factory‑style 10‑pin connector for tool‑free swapping and minimal downtime.

Fitment notes

• Intended for use with LED bulbs and 10‑pin flasher modules; not compatible with GMT900 or other platforms.
• Please verify your vehicle’s original part number and platform before purchase to confirm compatibility.

In real‑world use, drivers often notice a steadier signaling cadence after installation and a quieter, more predictable operation of turn signals and hazards when LEDs are used. The LM487 is a small, unobtrusive module that slots into the existing harness and preserves the vehicle’s factory look and feel while supporting modern lighting choices.

Installation is straightforward: locate the original flasher module, disconnect the harness, and swap in the LM487. No special tools are required, and the unit’s 10‑pin design aligns with the GMT800 system for a clean, dependable replacement that minimizes downtime.

What to know before you buy

• This part is intended for LED bulb setups and 10‑pin GMT800 applications; it is not designed for GMT900 or non‑GMT800 platforms.
• Double‑check your vehicle’s year, model, and platform to ensure a proper match with the LM487 part numbers listed above.

Choosing the LM487 gives you a practical, evidence‑based option to address LED signaling quirks. While results can vary by vehicle and configuration, many users report smoother LED signaling without the need for professional rework, keeping your signals reliable and legible in everyday driving conditions.